How does Chapter 21 describe the ideal relationship between a spiritual narrator and the listener?

Chapter 21 of the Sai Satcharitra begins by describing the ideal dynamic between a speaker and a listener in a spiritual context. The text suggests that a narrator's words are only truly effective if they deeply move the audience. The signs of a successful narration are described vividly: the listener should 'sway upon hearing them,' the 'hair on the body' should stand on end, the throat should 'choke up with emotion,' and 'tears of love and joy' should flow from the eyes. As mentioned in Chapter 21, if these emotional and physical responses are absent, the narration is considered futile and the words have 'gone in vain,' highlighting the importance of a heartfelt connection to the divine stories being told.